I have the paid version of version 6. I have the settings detect new network automatically. Also under network rules make sure any program that needs to use your LAN/Internet has at least custom access.

I would look elsewhere for a free firewall, as OP free has not been supported by the developer for quite some time. In fact, they are concentrating their efforts primarily on the newest version 6 (trial).

I agree with wat0114. The free Outpost gave my computer the BSOD when I tried it a few months back. There are a ton of good free firewalls that are offered all over. Don't waste your time with Outpost free. Just do a search for free firewalls or just check out this thread for what others are using-